Copyright 2012 Scripps Media, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.

BROKEN ARROW, Okla. - The Broken Arrow Police Department says an anonymous donor has posted a $15,000 reward for information that will assist in locating Cobb if his disappearance is criminal in nature.

Justin Cobb worked as a heating and Air technician for Mullin Service in Broken Arrow. On August 10, the 35-year-old finished his service calls in Tulsa around 4:30 p.m. then seemingly disappeared.

Five days later, his service van was found in a remote area of Okmulgee County near Haskell.

Major Mark Irwin says Cobb's clothes, cell phone, wallet, and other belongings were still inside the van. But there was no sign of Cobb.

"We had up to 30 people out there at a give time," Irwin said. "We conducted foot searches. We've had ATVs out there. We conducted some aerial searches as well, to no avail."

Irwin says there's been no activity on Cobb's credits cards or bank account since the day he disappeared.

"We don't have enough information to indicate anything criminal took place," Irwin said. "But we don't have any information that leads to the contrary either. It's just puzzling at this point."

Cobb's loved ones tell 2NEWS they don't believe he would have walked away from his life, leaving his friends and family to worry. They hope the $15,000 reward, will be enough to get someone with information on what may have happened to Cobb to finally speak up.

Tips should be called into Crime Stoppers at 918-596-COPS. Normally if a tip leads to an arrest, the reward is paid out through the Crime Commission. But in this case, the money would be provided by the donor.

Cobb is described as a white male, approximately 6 feet 4 inches tall and around 208 pounds.

Copyright 2012 Scripps Media, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.